JPH10141226A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a structure of a hermetic compressor, form the compressor in a small size, light a weight of the compressor, and avoid leakage of ammonia refrigerant by using aluminum enamel wire resisting ammonia, for a winding wire of a stator. SOLUTION: In a stator 6, its winding wire is made of aluminum, coating for ammonia resistance is carried out thereon so as to ensure a high reliability. Ammonia refrigerant 5 sucked from an inlet part 4 of a half or fully hermetic compressor 3, is compressed by a screw rotor 8 which is rotated by the stator 6 as a motor and a rotator 7, and is delivered from a delivering part 9. By ammonia refrigerant 5 sucked from the inlet part 4 of low pressure and a low temperature, the winding wire of the stator 6 is cooled, and raising of a temperature and excessive heating are suppressed. It is eliminated that ammonia refrigerant 5 and freezer oil are leaked from a shaft seal so as to facilitate maintenance, and ensure a high reliability. A water cooling jacket is eliminated, a structure is simplified, and is formed in a small size and lightly.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a hermetic compressor.

[0002]

2. Description of the Related Art There are two types of compressors that can handle ammonia refrigerant: an open type and a cand type.

The open type is the most common in the prior art, and since the compressor and the motor are connected by a shaft, the motor does not come into direct contact with the ammonia refrigerant. But,
Since the shaft rotates at high speed, leakage of the ammonia refrigerant and the refrigerating machine oil from the seal portion cannot be avoided. In addition, the compressor and the motor are separately provided in terms of structure, and the size is increased.

The cand type is described in a frozen Vol. 69 No. 799 (May 1994, p. 97) as a prior art close to the present invention, but the stator of the motor (stator) is a wall called a can. And is separated from the rotor (rotor) so as not to contact the ammonia refrigerant. In addition, water is used for cooling and noise reduction of the motor, and the structure is complicated because the structure is covered with a water cooling jacket.

The rotor (stator) of a conventional semi-hermetic compressor using a Freon 22 refrigerant is generally made of enameled copper wire as a winding material. could not.

[0006]

Prior art open or candle type motors cannot directly contact the ammonia refrigerant. Therefore, the open type has a large structure, and the candle type has a complicated structure.

In order to solve these problems, a compressor having a structure in which a motor is built in the compressor and having a structure in which an ammonia refrigerant is directly contacted and cooled without using a can has been developed. Therefore, it is small and lightweight, and it is possible to avoid ammonia refrigerant leakage.

[0008]

An aluminum enameled wire which does not deteriorate even when it comes into contact with an ammonia refrigerant and can withstand ammonia is adopted for the winding of the stator (stator), so that it can be used as an open type. It is not necessary to use a separate motor, and the candle type can can be eliminated.

The use of a stator (a stator) employing an aluminum enameled wire eliminates leakage of ammonia refrigerant and refrigerating machine oil from a shaft seal which cannot be avoided in an open type, thereby ensuring high reliability. can do.

[0010] In the candle type, not only the can functioning to separate the stator (stator) from the rotor (rotor) is not required, but also the cooling of the motor is enabled by the circulation of the ammonia refrigerant. Is also unnecessary, and the structure is extremely simplified.

[0011]

FIG. 1 shows the structure of a stator (stator) employing an aluminum enameled wire according to the present invention.

FIG. 2 shows the internal structure of a screw compressor as a compressor incorporating a stator (stator).

FIG. 3 shows the internal structure of a conventional open type compressor, and FIG. 4 shows the internal structure of a cand type compressor.
Shown in

The winding 1 of the conventional stator (stator) uses an enameled copper wire in the case where Freon 22 refrigerant is used. However, this winding itself is made of aluminum, and an ammonia-resistant coating 2 is applied. To ensure high reliability.

The ammonia refrigerant 5 sucked from the suction part 4 of the semi-hermetic or fully hermetic screw compressor 3 is supplied to a stator (stator) 6 as a motor and a rotor (rotor).
The screw rotor 8 is rotated by 7, and the refrigerant gas compressed by the screw rotor 8 is discharged from the discharge unit 9. At this time, since the ammonia refrigerant sucked from the suction part 4 has a low pressure and a low temperature, it cools the winding 1 of the stator (stator) and suppresses a rise in temperature and overheating. It is extremely simple in structure.

In the case of the open-type compressor 10 shown in FIG. 3, the screw rotor 8 and the stator (stator) 6 and the rotor (rotor) 7 are provided separately, and power is transmitted through a shaft 11.
Therefore, leakage from the shaft seal portion cannot be avoided.

In the canned type compressor 12 shown in FIG. 4, the ammonia refrigerant 5 sucked from the suction portion 4 is separated from the stator (stator) 6 by the can 13, so that they do not come into contact with each other. Absent. Therefore, as a method of cooling the stator (stator) 6, the water cooling jacket 14 is used.
Water must always be passed using

[0018]

According to the present invention, there is no leakage of the ammonia refrigerant and the refrigerating machine oil from the shaft seal, which could not be avoided in the open type compressor, and the maintenance is facilitated and the high reliability is secured. It becomes possible.

Further, in the cand type compressor, a water-cooling jacket required for cooling the stator (stator) is not required, so that the structure is considerably simple, and the size and weight can be reduced. Also, the efficiency of the motor is low due to the use of a can.
% Improvement in motor efficiency is conceivable.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a stator employing an aluminum enameled wire according to the present invention.

FIG. 2 is an explanatory view of the internal structure of a semi-hermetic and fully hermetic screw compressor incorporating a stator.

FIG. 3 is an explanatory diagram of an internal structure of an open-type compressor according to the related art.

FIG. 4 is an explanatory diagram of the internal structure of a conventional candle-type compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... stator winding, 2 ... coating, 3 ... screw compressor, 4 ... suction part, 5 ... ammonia refrigerant, 6 ... stator,
7 ... rotor, 8 ... screw rotor, 9 ... discharge section.

Claims (1)

[Claims] 1. A hermetic compressor having a built-in aluminum motor.